Nuclearia delicatula
Nuclearia delicatula

 

 

Nuclearia delicatula Cienkowski, 1865

 

Diagnosis: Cell spherical to flattened elongated; variable, surrounded by a mucilaginous coat, varying in thickness from 2-3 µm; bacteria often adhering to this envelope. Filopodia radiating from all regions of the cell but a thicker, shorter, and more contractile pseudopodium was often observed and may be connected with the attachment of cells to the substratum. Multinucleated, 4-12 nuclei, nucleoli smooth and rounded, sometimes irregular. Two or three contractile vacuoles per cell. No cysts observed. No crystals were observed in the cytoplasm. Reproduction by binary fission.

 

Dimensions: diameter spherical cells 22-50 µm, elongated trophic forms reached 40 um, with an average width of 66 um. Nuclei c. 7.5 µm, nucleoli 3 µm in diameter.

 

Ecology: Freshwater. Feeding on diverse filamentous algae and diatoms.

 

Nuclearia delicatula
Nuclearia delicatula
Nuclearia delicatula, with four nuclei visible and (r.) with ingested alga and two nuclei visible
Nuclearia delicatula
N. delicatula, Kromme Rijn, Netherlands
Nuclearia delicatula
Specimen trying to ingest an alg
Surface with many small vacuoles
Large specimen with ingested blue algae
Nuclearia delicatula
Nuclearia delicatula, surrounded by a sphere of debris. The amoeba has digested a diatom and pushes the empty shell out of his body.
Nuclearia delicatula
The diatom has left the plasmabody and the amoeba starts opening the sphere of debris.
Nuclearia delicatula
Nuclearia delicatula leaves its sphere of debris.
Nuclearia delicatula
Nuclearia delicatula out of the debris. Small bacteria indicate the layer of mucus which surrounds the cell.